I can see the dilemma. You want to get your money back and protect others from someone you feel did not perform the services he/she promised. The GCM wants to maintain his/her livelihood. The threat of a suit for defamation seems a bit over the top, but I have no expertise in this field. I don’t think you are going to get everything you want – both the ability to speak publicly about your experience and a refund. You should probably make a choice based in large part on how much of a threat to others you feel this person is. If you decide to forego the refund and make your complaints public, it would make sense to get legal advice on the defamation issue. But given the fact that life is short, you might be best off accepting the refund and moving on.
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